<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../vue.global.js"></script>
</head>

<body>
    <div id="app">
        <ul>
            <li v-for="n in evenNumbers" :key="n">{{ n }}</li>
        </ul>
    </div>

    <script>
        const app = {
            data() {
                return {
                    numbers: [1, 2, 3, 4, 5]
                }
            },
            computed: {
                // 二手数据 过滤出numbers中的偶数
                evenNumbers() {
                    return this.numbers.filter(number => number % 2 === 0)
                }
            }
        }
        Vue.createApp(app).mount("#app")
    </script>
</body>

</html>